void unzip(const FieldField< Field, SphericalTensor< Cmpt >> &input, FieldField< Field, Cmpt > &ii)
Unzip sphericalTensor field field into components.
void zip(FieldField< Field, SphericalTensor< Cmpt >> &result, const FieldField< Field, Cmpt > &ii)
Zip together sphericalTensor field field from components.